I just bought a 99 Dodge Quad-cab with a 360 Auto in it. I had a bunch of problems with my transmission with the OD turning off and the trans Over temp light coming on. They fixed that problem and then the trans would not shift into 1st gear when at a stop. Then they fixed that problem. Truck runs awesome now but my Cruise control does not stay at the same speed it works and then it screws up. I could be going along and then I hit a hill and it slows down, I put my foot on the gas for a second then it goes back to speed. Does anybody have this same problem.
And here is some picts of my dodge

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Look under the battery tray at the cruise control servo. There are a couple of vacuum lines down there, check to make sure they arent cracked/dissconnected. That is the only thing I can think of since on my 97, i had similat problems. Hope this helps, if not, good luck.